Toshiba FT-8508, Service Manual

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Set the handset in the test
mode 3, check whether
deviation of the TX data is
app. 7 kHz Dev.
Set the handset in the test
mode 6, 926.893873 MHz
(250 Hz ±7 kHz Dev.) 1mV
output signal from RF jack
is applied. Check whether
the bell ring.
NG
Check whether there is a
250Hz data waveform at
Pin 9 of J601.
NG
Check VR601, R619, R632,
R634, R635, R636
and C611.
OK
Check handset RF unit.
Check whether the 250 Hz
data wareform from Pin 1
of J601 is fed.
Place the handset on the
base to charge about
5 seconds, then connect
again.
NG
Check handset RF unit.
NG
OK
Check whether there is a
250 Hz data waveform at
the Q601 collector.
OK
Check VR602, Q601 and
their peripheral circuits.
NG
OK
Check whether there is a
250 Hz data waveform at
Pin 40 of IC603. Check Q602, Q604 and
their peripheral circuits.
NG
OK
Check IC603 and its
peripheral circuit.
OK